Potassium Carbonate → 2-Ethyl-3-[[2-(1-methyl-1h-pyrazol-4-yl)-4-pyridinyl]oxy]-6-nitropyridine

HRID 1049247Notes

Reaction equation

[CH3:1][N:2]1[CH:6]=[C:5](B2OC(C)(C)C(C)(C)O2)[CH:4]=[N:3]1.Cl[C:17]1[CH:22]=[C:21]([O:23][C:24]2[C:25]([CH2:33][CH3:34])=[N:26][C:27]([N+:30]([O-:32])=[O:31])=[CH:28][CH:29]=2)[CH:20]=[CH:19][N:18]=1.C([O-])([O-])=O.[K+].[K+]>O1CCOCC1.O.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[CH2:33]([C:25]1[C:24]([O:23][C:21]2[CH:22]=[CH:17][N:18]=[C:19]([C:5]3[CH:4]=[N:3][N:2]([CH3:1])[CH:6]=3)[CH:20]=2)=[CH:29][CH:28]=[C:27]([N+:30]([O-:32])=[O:31])[N:26]=1)[CH3:34]

Participants

Conditions

Temperature: 80 °C

Procedure

A mixture of 1-methyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole (863 mg, 4.15 mmol), 3-((2-chloropyridin-4-yl)oxy)-2-ethyl-6-nitropyridine (892 mg, 3.19 mmol), K2CO3 (1.322 mg, 9.57 mmol) and Pd(PPh3)4 (184 mg, 0.159 mmol) in dioxane (6 mL) and water (1.5 mL) was sparged with Ar, heated at 80° C. for 24 h, then cooled to RT and stirred for 24 h. The mixture was treated with EtOAc, washed with satd. NaHCO3 (1×), then brine (1×), dried over Na2SO4 and concentrated to dryness to afford 2-ethyl-3-((2-(1-methyl-1H-pyrazol-4-yl)pyridin-4-yl)oxy)-6-nitropyridine (100% yield assumed) as a thick oil. Material carried on to the next step without purification. MS (ESI) m/z: 326.1 (M+H+).

Workup

customwas sparged with Ar
temperaturecooled to RT
additionThe mixture was treated with EtOAc
washwashed with satd
dry with materialNaHCO3 (1×), then brine (1×), dried over Na2SO4
concentrationconcentrated to dryness

Sources & evidence

ORD record: ord-274efb2cc31347cbb6f6c1b438c2bb2f
Source dataset: uspto-grants-2016_07
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09382228B2

Reaction notes

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